code: def __init__(self, val, left=None, right=None):
      self.val = val
      self.left = left
      self.right = right
  
imports: from algorithms.tree.traversal import preorder, preorder_rec, postorder, postorder_rec, inorder, inorder_rec
  from algorithms.tree.b_tree import BTree
  from algorithms.tree import construct_tree_postorder_preorder
  from algorithms.tree.fenwick_tree.fenwick_tree import Fenwick_Tree
  import unittest
label_desc: Use image node_id 1 to create a new Node object  with example: obj = Node(val, left, right)